Relevant bibliographies by topics / Half-power bandwidth method

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Academic literature on the topic 'Half-power bandwidth method'

Author: Grafiati
Published: 4 June 2021
Last updated: 3 February 2022

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Journal articles on the topic "Half-power bandwidth method"

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Wu, Baisheng. "A correction of the half-power bandwidth method for estimating damping." Archive of Applied Mechanics 85, no. 2 (August 17, 2014): 315–20. http://dx.doi.org/10.1007/s00419-014-0908-0.

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Lozia, Zbigniew, and Piotr Zdanowicz. "Simulation assessment of the half-power bandwidth method in testing shock absorbers." Open Engineering 11, no. 1 (December 12, 2020): 120–29. http://dx.doi.org/10.1515/eng-2021-0011.

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AbstractThe work deals with usability of the half-power bandwidth method in the diagnostic testing of automotive shock absorbers. In all the simulation tests, the front and rear suspension system of a present-day medium-classmotor car was considered. At the first stage, calculations were made in the frequency domain for a linear “quarter-car” model with two degrees of freedom; then, simulations were carried out in the time domain with using a similar but strongly nonlinear model. In the latter case, actual characteristics (corresponding to those obtained from test rig measurements) of shock absorber damping, suspension and tire elasticity, sliding friction in the suspension, and “wheel hop” were considered. The calculations were carried out every time for twelve levels of viscous damping in the suspension system, which made 48 calculation series in total. The factors of gain in the vertical force between the tester’s vibration plate and the vehicle tire (relative to the input force applied) and the dimensionless coefficients of viscous damping in the suspension system, determined by the half-power bandwidth method, were thoroughly analyzed. The calculation results were presented in graphical form. Attention was also paid to the distortions caused by the force of inertia of the tester’s vibration plate.
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Yerrawar, R. N., and R. R. Arakerimath. "Experimental investigations of damping characteristic for MR strut by half-power bandwidth method." Journal of Measurements in Engineering 6, no. 3 (September 30, 2018): 163–72. http://dx.doi.org/10.21595/jme.2018.20122.

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Guo, Zhi Wei, Mei Ping Sheng, and Jian Gang Ma. "Negative Ten Decibels Method for Damping Identification of Light Damping Structure." Applied Mechanics and Materials 577 (July 2014): 170–73. http://dx.doi.org/10.4028/www.scientific.net/amm.577.170.

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Half power method is commonly used in structural damping identification because of its simplicity in algorithm. But when the damping is very small, half power method will lead a big error. In order to get more accurate result of small damping structure, this paper suggests using negative ten decibels method (N-10dB) instead of half power method. N-10dB method takes 10-dB bandwidth into consideration, differs from 3-dB of half-power method. The theory of this method is given firstly and proves that it is very simple in algorithm. Subsequent simulation and experiment show that, compared with half power method, N-10dB method have stronger noise resistance, higer precision and is more stable in repeated measurements. Except that, the N-10dB method is also practical in engineering test.
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Siva Sankara Rao, Yemineni, Kutchibotla Mallikarjuna Rao, and V. V. Subba Rao. "Estimation of damping in riveted short cantilever beams." Journal of Vibration and Control 26, no. 23-24 (March 20, 2020): 2163–73. http://dx.doi.org/10.1177/1077546320915313.

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In layered and riveted structures, vibration damping happens because of a micro slip that occurs because of a relative motion at the common interfaces of the respective jointed layers. Other parameters that influence the damping mechanism in layered and riveted beams are the amplitude of initial excitation, overall length of the beam, rivet diameter, overall beam thickness, and many layers. In this investigation, using the analytical models such as the Euler–Bernoulli beam theory and Timoshenko beam theory and half-power bandwidth method, the free transverse vibration analysis of layered and riveted short cantilever beams is carried out for observing the damping mechanism by estimating the damping ratio, and the obtained results from the Euler–Bernoulli beam theory and Timoshenko beam theory analytical models are validated by the half-power bandwidth method. Although the Euler–Bernoulli beam model overestimates the damping ratio value by a very less fraction, both the models can be used to evaluate damping for short riveted cantilever beams along with the half-power bandwidth method.
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Papagiannopoulos, George A., and George D. Hatzigeorgiou. "On the use of the half-power bandwidth method to estimate damping in building structures." Soil Dynamics and Earthquake Engineering 31, no. 7 (July 2011): 1075–79. http://dx.doi.org/10.1016/j.soildyn.2011.02.007.

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Wang, Jin-Ting, Feng Jin, and Chu-Han Zhang. "Estimation error of the half-power bandwidth method in identifying damping for multi-DOF systems." Soil Dynamics and Earthquake Engineering 39 (August 2012): 138–42. http://dx.doi.org/10.1016/j.soildyn.2012.02.008.

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Olmos, Bertha A., and Jose M. Roesset. "Evaluation of the half-power bandwidth method to estimate damping in systems without real modes." Earthquake Engineering & Structural Dynamics 39, no. 14 (October 26, 2010): 1671–86. http://dx.doi.org/10.1002/eqe.1010.

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Fu, Jingcheng, Jun Huang, Li-Bo Wang, and Lei Song. "Oscillation mode flight data analysis based on FFT." Aircraft Engineering and Aerospace Technology 91, no. 1 (January 7, 2018): 157–62. http://dx.doi.org/10.1108/aeat-04-2018-0139.

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Purpose The purpose of this paper is to propose an identification method of acquiring aircraft mode characteristics based on fast Fourier transform and half-power bandwidth method, aiming at the common oscillation met in flight test. Design/methodology/approach The feasibility of this method is demonstrated through derivation; the robustness analysis is conducted through three examples, and finally the method was applied on a set of sideslip angle record from flight test. Findings The derivation and numerical analysis both show that the presented method can have high accuracy and good robustness under coupled mode and noise condition. Practical implications The method proposed is of robustness, and it is concise and easy to apply on flight data record. Originality/value This paper demonstrates the feasibility of half power bandwidth to be applied on oscillation mode characteristics identification from flight data record, which is different from other method applied.
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Szulej, Jacek. "The method of determining damping coefficients of vibration for complex structures." Budownictwo i Architektura 5, no. 2 (December 13, 2009): 039–59. http://dx.doi.org/10.35784/bud-arch.2344.

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The purpose of this paper is to present methods of determining damping coefficient of vibration. The methods, such as: collocation method, two energetic methods and half-power bandwidth method, concern composite structures. Verification of methods was taken into account in this research. Real compound models and numerical models were created. Time histories of vibrations of these models were measured or calculated. Comparison of methods were made on a basis of obtained results.
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Dissertations / Theses on the topic "Half-power bandwidth method"

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Acar, Yalda, and Pontus Jingstål. "Influence of the Non-linear Effects in the Design of Viscous Dampers for Bridge Cables." Thesis, KTH, Bro- och stålbyggnad, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-153956.

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In this master thesis the performance of external viscous dampers attached to cables in cable-stayed bridges have been studied. A comparison has been performed between a linear and a non-linear cable model. The comparison was carried out for two bridge cables, one from the Dubrovnik Bridge and the other from the Normandie Bridge. The performance of the dampers have been measured in terms of maximum achieved damping ratio and minimum amplitude of vibration. The analysis was performed using the finite element method. The damping ratio was measured using both the half-power bandwidth method and by calculating the loss factor. The half-power bandwidth method can only be applied to a linear system. Therefore, the loss factor was evaluated for the linear model and compared to the results obtained using the half-power bandwidth method. From the comparison, it was concluded that the damping ratio evaluated using the loss factor was similar to the results obtained when using the half-power bandwidth method. However, when calculating the loss factor, it was of great importance that the resonance frequency of the system was accurately determined. The loss factor was then calculated for the non-linear model and compared to the results obtained for the linear model. Since the loss factor measures the energy dissipated in a system, it could be utilised for the non-linear model. When computing the strain energy for the non-linear model an approximate method was used to take into consideration the strain energy caused by the static deformation of the cable. From the comparison between the linear and non-linear cable models, it was concluded that the optimal damper coefficients obtained by both models are not significantly different. However, there is an uncertainty in the results due to the fact that an approximate method was used when calculating the strain energy for the nonlinear model. It was also observed that a very accurate evaluation of the system’s resonance frequency was needed to calculate the loss factor. It was also observed that the variation in amplitude of vibration for varying damper coefficient was small for all modes of vibration for the Dubrovnik Bridge Cable as well as for the first mode of vibration for the Normandie Bridge Cable. The difference in the results between the two bridge cables needs to be investigated further in order to get a better understanding of the results.
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Conference papers on the topic "Half-power bandwidth method"

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Badsar, S. A., M. Schevenels, W. Haegeman, and G. Degrande. "Determination of the Damping Ratio in the Soil from SASW Tests Using the Half-power Bandwidth Method and Arias Intensity." In Near Surface 2010 - 16th EAGE European Meeting of Environmental and Engineering Geophysics. European Association of Geoscientists & Engineers, 2010. http://dx.doi.org/10.3997/2214-4609.20144773.

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Moran, Joaquin E., and David S. Weaver. "Damping Measurements in Tube Bundles Subjected to Two-Phase Cross Flow." In ASME 2006 Pressure Vessels and Piping/ICPVT-11 Conference. ASMEDC, 2006. http://dx.doi.org/10.1115/pvp2006-icpvt-11-93431.

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An experimental study was conducted to investigate two-phase damping in tube arrays. The objective was to compare different measurement methodologies in order to obtain a more reliable damping estimate. This will allow for improved guidelines related to failures due to fluidelastic instability in tube bundles. The methods compared were the traditionally used half-power bandwidth, the logarithmic decrement and an exponential fitting to the tube decay response. The working fluid used was Refrigerant 11 (Freon), which better models the real steam-water problem, as it allows for phase change. The void fraction was measured using a gamma densitometer, introducing an improvement over the traditional Homogeneous Equilibrium Model (HEM) in terms of velocity and density predictions. The results obtained by using the half-power bandwidth method agree with data previously reported for two-phase flow. The experiments showed that the half-power bandwidth produces higher damping values than the other two, but only up to a certain void fraction. After that point, the results obtained from the three methods are very similar. The exponential fitting proved to be more consistent than the logarithmic decrement, and it is not as sensitive as the half-power bandwidth to the frequency shifting caused by the change in added mass around the tube. By plotting the damping ratio as a function of void fraction, pitch mass flux and flow regime, we were able to verify that damping is more dependent on void fraction and flow regime than on mass flux.
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Liu, Hongzhao, Ziying Wu, Lilan Liu, Daning Yuan, and Zhongming Zhang. "Research on Nonlinear Damping Characteristics of Damping Alloy With Uniform Stress Field." In ASME 7th Biennial Conference on Engineering Systems Design and Analysis. ASMEDC, 2004. http://dx.doi.org/10.1115/esda2004-58144.

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For the high damping metal material like damping alloy, the damping capacity usually changes with the strain amplitude and frequency nonlinearly. First, to extract the pattern of the internal damping versus strain, two time-domain calculation methods are presented in this paper. One is the moving exponent method (MEM for short) based on FFT (MEM+FFT) and the other is the moving autoregressive model method (MARM). The computing accuracy of the two methods has been compared through numerical simulations. The nonlinear relation curve of loss factor versus strain is achieved by the impulse excitation experiment employing uniform stress field. Then, to extract the pattern of the internal damping versus vibrating frequency, the sine sweep-frequency excitation experiment based on the half-power bandwidth method is carried out. The resulting curve indicates that the internal damping is also a nonlinear function of frequency.
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Park, Tae-Jung, Chang-Hoon Ha, Min-Ki Cho, Heung Seok Kang, and Kang Hee Lee. "Experimental Damping of a Heat Exchange Tube With a Large Number of Supports in Air and Water." In ASME 2017 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/pvp2017-66158.

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The flow induced vibration occurs frequently in a steam generator in the nuclear power plant. The large-scale steam generator has a large number of tube supports whose cell has rhombus-type shape, and there is a tiny clearance between tube and its support grid. The damping is very complex because of non-linearity and randomness. The experiment for damping was performed to investigate it with a number of 13 support spans both in air and water environment. The lower part of multi-span fixture was excited by root-mean-square random force with the range of 1∼10 newton to get the frequency response function. The half-power bandwidth method was applied to obtain the damping ratio. The sensitivity of a number of spans was investigated in the range of 9 ∼ 13. In addition, the damping was reviewed from a comparison with Pettigrew [1∼4] and ASME B&PV Code [5].
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Lumsdaine, Arnold. "Topology Optimization of Constrained Damping Layer Treatments." In ASME 2002 International Mechanical Engineering Congress and Exposition. ASMEDC, 2002. http://dx.doi.org/10.1115/imece2002-39021.

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The aim of this research is to determine the optimal shape of a constrained viscoelastic damping layer on an elastic beam by means of topology optimization. The optimization objective is to maximize the system loss factor for the first resonance frequency of the base beam. All previous optimal design studies on viscoelastic lamina have been size or shape optimization studies, assuming a certain topology for the damping treatment. In this study, this assumption is relaxed, allowing an optimal topology to emerge. The loss factor is computed using the Modal Strain Energy method in the optimization process. Loss factor results are validated by using the half-power bandwidth method, which requires obtaining the forced response of the structure. The ABAQUS finite element code is used to model the structure with two-dimensional continuum elements. The optimization code uses a Sequential Quadratic Programming algorithm. Results show that significant improvements in damping performance, on the order of 100% to 300%, are obtained by optimizing the constrained damping layer topology. A novel topology for the constraining layer emerges through the optimization process.
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Nutakor, Charles, R. Scott Semken, Janne E. Heikkinen, Jussi Sopanen, and Aki Mikkola. "Layered Sheet-Steel Damping Estimation Using Optical Vibrometry." In ASME 2015 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/detc2015-46867.

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A non-contact modal analysis method is implemented to estimate the structural damping ratios for four stacks of sheet-steel, each bound using a different method. The setup comprised the four subject stacks and, for comparison, two single homogeneous steel plates of the same length and width with thicknesses that approximated the layered stack heights. To carry out the modal analyses, each test item was hung to simulate a free-free boundary condition. A force and frequency adjustable impact hammer imparted transient vibration to each hanging test piece after which the local relative velocity for each one of an array of discrete target points across the entire length-to-width surface was measured using an optical transducer. Damping ratios were extracted from the frequency response curves using the half power bandwidth method. Comparing the results obtained for the layered sheet-steel stacks with those from the homogeneous steel plates showed that damping ratios and loss factors can be estimated using the proposed experimental technique. The consistent impacts and the elimination of test structure mass loading improves the accuracy of damping estimates. In comparison to the solid plates, the layered sheet-steel stacks were characterized by increased damping. The effect was most significant for the stack bound together by polymer rivets.
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Lumsdaine, Arnold, and Rohan Pai. "Design of Constrained Layer Damping Topologies." In ASME 2003 International Mechanical Engineering Congress and Exposition. ASMEDC, 2003. http://dx.doi.org/10.1115/imece2003-42980.

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The aim of this research is to determine the optimal topologies for viscoelastic lamina used for vibration damping. The optimization objective is to maximize the system loss factor for the first resonance frequency of a base structure. Previous optimal design studies examining viscoelastic lamina have been size or shape optimization studies, assuming a certain topology for the damping treatment. In this study, the topology is optimized to maximize vibration damping levels. The loss factor is computed using the Modal Strain Energy method in the optimization process. For the initial and optimal topologies, the loss factor results are validated by using the half-power bandwidth method, which requires obtaining the forced response of the structure. The ABAQUS finite element code is used to model the structure with two-dimensional, plane stress, continuum elements. The optimization code uses a Sequential Quadratic Programming algorithm. This study extends the results of a previous study by Lumsdaine (2002) by examining the effects of a number of parameters on the optimal damping levels and the optimal topologies. The parameters examined include the total elastic and viscoelastic material fractions and the base beam thickness. Results show that significant improvements in damping performance, over 300% in some cases, are obtained by optimizing the constrained damping layer topology.
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Moran, Joaquin E., and David S. Weaver. "On Damping and Fluidelastic Instability in a Tube Bundle Subjected to Two-Phase Cross-Flow." In ASME 2007 Pressure Vessels and Piping Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/pvp2007-26458.

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An experimental study was conducted to investigate damping and fluidelastic instability in tube arrays subjected to two-phase cross-flow. The purpose of this research was to improve our understanding of these phenomena and how they are affected by void fraction and flow regime. The working fluid used was Freon 11, which better models steam-water than air-water mixtures in terms of vapour-liquid mass ratio as well as permitting phase changes due to pressure fluctuations. The damping measurements were obtained by “plucking” the monitored tube from outside the test section using electromagnets. An exponential function was fitted to the tube decay trace, producing consistent damping measurements and minimizing the effect of frequency shifting due to fluid added mass fluctuations. The void fraction was measured using a gamma densitometer, introducing an improvement over the Homogeneous Equilibrium Model (HEM) in terms of density and velocity predictions. It was found that the Capillary number, when combined with the two-phase damping ratio (interfacial damping), shows a well defined behaviour depending on the flow regime. This observation can be used to develop a better methodology to normalize damping results. The fluidelastic results agree with previously presented data when analyzed using the HEM and the half-power bandwidth method. The interfacial velocity is suggested for fluidelastic studies due to its capability for collapsing the fluidelastic data. The interfacial damping was introduced as a tool to include the effects of flow regime into the stability maps.
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Hujare, Pravin P., Anil D. Sahasrabudhe, and Sanket D. Chinchawade. "Experimental and Numerical Analysis of the Effect of Segmentation on Modal Loss Factor of Constrained Layer Damped Beam." In ASME 2014 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/detc2014-34862.

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This paper presents experimental investigation on the damping effects of constrained layer treatment by cutting the constraining layer and constrained layer of viscoelastic material (VEM). The constraining layer causes shear in the damping material as the structure deforms. The shear deformation occurring in the viscoelastic core is mainly responsible for the dissipation of energy. The shear deformation in the VEM is not significant in regions where the bending moment is maximal. Mostly only extensional deformation occurs in the damping layer. The local high-shear deformation in the damping material is produced by placing a cut at the region of highest curvature. Cutting both the constraining and the constrained layer, which leads to segmentation, increases the shear deformation at that position. This appropriate position of high bending moment for segmentation is obtained by MATLAB program. The modal loss factor of constrained layer damped (CLD) beam is obtained by half-power bandwidth method using FFT analyzer. The CLD beams are prepared as per ASTM Standard E 756-05. Extensive experiments are conducted by making number of separate segmented CLD beams of different viscoelastic damping materials. A three dimensional model of cantilever CLD beam has been used for numerical analysis. In this work, finite element commercial software MSC/NASTRAN is used to simulate the dynamic response of a CLD beam. The modal loss factor of constrained layer damped (CLD) beam is measured by Modal Strain Energy (MSE) Method. This is a new method for enhancement of damping capabilities of constrained layer damping. It is found that the performance of segmented CLD beam using passive treatment shows significant improvement in modal loss factor which leads to vibration attenuation of beam. The numerical results are corroborated with experimental data obtained for segmented CLD beam. The analyzed finite element models are found to provide reliable results and compared very well with experimentally acquired data.
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Ji, Xiang, Yong Chen, Hai Liu, Hanzhengnan Yu, Changyin Wei, and Zhibiao Yan. "Experimental Investigation on the Vibration and Noise Characteristics of the Vibration Damping Alloy Material." In ASME 2018 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/imece2018-87189.

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Due to the stricter roles of the government and the higher requirement of a comfortable automobile, the NVH (Noise Vibration and Harshness) performance of vehicles has become one of the most important traits at the automobile market. Considering the cost, it is more economical and practical to improve the NVH performance by using the vibration-isolating or noise-reducing materials. Vibration damping alloy as one of the new material has a promising prospect due to its great damping characteristics. In this paper, the vibration-isolating and noise-reducing performances of the vibration damping alloy have been experimentally investigated in a semi-anechoic room. Frequency response function test has been carried with the test rod made of vibration damping alloy and 45 steel to calculate the damping ratio of the two materials based on the half-power bandwidth method. The radiation noise characteristics of the two test rods under different excitation forces have also been evaluated. Conclusions drawn from the experiment suggested that the damping ratio of 45 steel rod were 0.0125 in vertical axial direction and 0.0165 in axial direction. While, the damping ratio of vibration damping alloy rod were 0.0236 in vertical axial direction and 0.0234 in axial direction, 89% and 42% higher than the 45 steel sample, respectively. With the increase of the exciting force, the radiation noise increased for both two materials, and the radiation noise level of the vibration damping alloy rod was much lower than 45 steel rod. And the difference between these two materials remained unchanged with the increase of exciting force. In addition, the duration of noise attenuation for vibration damping alloy rod was much shorter than the 45 steel.
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